arXiv · 2507.01262
Structure studies of 257Db through combined {\alpha}, {\gamma} and internal-conversion-electron spectroscopy
Abstract
This work reports on the study of the decay properties along the $^{257}$Db decay chain using the GABRIELA setup. The first observation of a high-K isomer in $^{257}$Db is presented. In addition, an unreported $\alpha$-decay branch in $^{249}$Md has been evidenced, allowing to constrain the differences in energy of the $\alpha$-decaying levels in $^{249}$Md, $^{253}$Lr and $^{257}$Db. Finally, the combination of the observed fine structure $\alpha$-decay from the high-spin state in $^{257}$Db with the first observation the internal decay in $^{253}$Lr requires a revision of level and decay scheme. In particular, a change of parity for the high-spin state from 9/2$^{+}$ to 9/2$^{-}$ in the $^{257}$Db is suggested, and the implications of such a change are also discussed.
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P. Brionnet, A. Lopez-Martens, O. Dorvaux, Z. Asfari, M. L. Chelnokov, V. I. Chepigin, H. Faure, B. Gall, K. Hauschild, A. V. Isaev, I. N. Izosimov, A. A. Kuznetsova, O. N. Malyshev, R. S Mukhin, J. Piot, A. G. Popeko, Y. A. Popov, K. Rezynkina, B. Sailaubekov, E. A. Sokol, A. I. Svirikhin, M. S. Tezekbayeva, A. V. Yeremin, N. I. Zamyatin. 2025-07-02. Structure studies of 257Db through combined {\alpha}, {\gamma} and internal-conversion-electron spectroscopy. https://arxiv.org/abs/2507.01262
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